Dynamic Expansion and Urbanization of Greater Cairo Metropolis, Egypt Ahmed Abdelhalim M. Hassan
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1 Ahmed Abdelhalim M. Hassan (MSc Ahmed Abdelhalim M. Hassan, Institue of Landscape Ecology, Muenster University, Robert-Koch Straße 28, D Münster, Germany, 1 ABSTRACT Since 1980th, rapid population growth and urbanization have become issues in big cities in developing countries like Greater Cairo. As a consequence of explosive growth, the living conditions of Cairo Metropolis deteriorate. Development trends of the last twenty years have increased general wealth and modernization, at a time of a high rate of population growth, thus creating an increased demand for land combined with environmental degradation. Planning a sustainable development of urban areas requires understanding of growth dynamics of urban systems. This talk will be concerned with monitoring and analysis of dynamic environment to capture and refine the urban patterns in Greater Cairo Metropolis on the basis of pixel-based and object-based classifications. Satellite images (TM, ETM+, & Spot) of different dates and resolutions, and ground truth data collected from available maps, field observation, and personal experience were used to execute the image segmentation analysis to reveal urban patterns and expansions. By using Erdas Imagine software, land use / land cover image classifications were constructed, which showed regimes and trends in urban growth change. The presented maps based on object segmentation have more accurate results than the produced maps based on pixel classification module. Two main types of urban patterns could be detected (passing from center to periphery). The first one is informal and the second one is formal building. The informal type mainly comprises slums and urban encroachment on arable land. The formal one mostly consists of new cities and legal houses. Moreover, a rate of urbanization growth during the last three decades would be described as geometrical progression. 2 INTRODUCTION Nowadays, three out of six human beings live in cities, two of whom live in developing citites. These figures illustrate the scale of the challenge represented by urban development in today s world and the growing pressure it currently puts on all levels of the city. Due to population growth, the urban and metropolitan sprawl in developing cities will continue to increase the inadequacy of these cities capacities institutional, financial and technical, but also human and even conceptual capacities in the face of urban issue that is harder and harder to grasp. Therefore, research on how to describe rapid growth of megacities by urbanization and especially land conversion of peri-urban environments has been identified as a pivotal area of current and future land-change research. Urban planners and administrative bodies require reliable information to assess the consequences of urbanization, to ensure a sustainable functioning of megacities and to minimize negative impacts of rapid urbanization. Urban expansion in the developing world often takes place in an unplanned manner and administration is unable to keep track of growth-related processes (Griffiths et al., 2009). Remote sensing based information is one of the most important resources to support urban planning and administration in megacities (Maktav et al., 2005). Remotely-sensed information is hence of particular relevance in the world's developing countries because it provides fundamental information on growth-related processes and their effect on the urban environment that are not available from other sources (Miller & Small, 2003). Although satellite imagery provides a synoptic view of the urban mosaic, remote-sensing data can be an important complement to limited in situ measurements in urban areas. Pixel-based approaches use conventional statistical techniques, such as supervised and unsupervised classification. In supervised classification, the image analyzed supervised the pixel categorization process by specifying, to the computer algorithm, numerical descriptions of the various land cover-types present in a scene. This approach has shown good accuracy for images acquired by course resolution sensors, while in the case of very high resolution (VHR) images it was considered that the spectral mutability increases within a particular class, making the extraction of thematic information more difficult (Foody, 2002). Various new Proceedings REAL CORP 2011 Tagungsband May 2011, Essen. ISBN: (CD-ROM); ISBN: (Print) Editors: Manfred SCHRENK, Vasily V. POPOVICH, Peter ZEILE 1251
2 techniques take into account, besides the spectral data, also the texture features of the image as an additional layer in the classification process (Puissant et al., 2005). An improved accuracy, especially for urban landuse/ land-cover classifications, has been proposed by the object-based classifications. Hence, object-based analysis facilitates work with meaningful image objects and their mutual relationships (Matinfar et al., 2007). This paper describes and discusses different remote sensing (RS) techniques to monitor and analyse dynamic expansion and urbanization in Greater Cairo. Since pixel-based analysis in complexly structured land-use and land-cover (LU/LC) areas is limited because the semantic information necessary to interpret an image is usually not represented in single pixels, both pixel-and-object-based approaches were applied and compared. This involves a certain trade-off between the richness of detail of VHR remote sensing imagery such as Spot Image and the generalizing nature of moderate to high resolution sensors such as the 30 m spatial resolution of Landsat TM and ETM+ used in this study. 3 STUDY AREA The selected area of study is the metropolitan area of Greater Cairo and its surroundings, which is known as the capital of Egypt and one of the fastest growing megacities worldwide (Fig. 1). The area covers about 600 km2, encompassing major parts of the governorates of Cairo, Giza, Six October, and Helwan. The Nile forms the administrative division between these governorates, with Cairo and Helwan on the east bank of the river and, Giza and Six October on the west bank. The area includes a variety of land uses associated with a complex mix of land cover, such as a central business district (CBD), urban/ suburban residential areas and some rural areas (e.g. cultivated areas and soil). This area has encountered rapid urban development and population growth in the last 20 years (Fig. 2). 4 MATERIALS AND METHODS Fig. 1: the study area-greater Cairo-Egypt This study is based on three Landsat TM & ETM images dates (path 176, row 39): 1984, 1990, and 2006 (the image of 1984 is considered as the reference year for the other images). Moreover, a multi-spectral spot mosaic acquired on 2006 has been chosen. These data were processed using ground control points and have a geometric error within 30, 15, and 5 m respectively. 4.1 Image processing A series of processing operations was performed on these images. The images were georeferenced using UTM map projection for zone 36 and WGS84 datum. The images were resampled to 30 m for bands 1, 2, 3, 4, 5, 7, to 15 m for panchromatice and to 60 m for thermal bands using the nearest neighbor technique. In 1252 REAL CORP 2011: CHANGE FOR STABILITY: Lifecycles of Cities and Regions
3 Ahmed Abdelhalim M. Hassan order to produce test area, false color composites from ETM+ bands 7, 5 and 3 were used, while all of the six bands (ETM+ bands 1, 2, 3, 4, 5 and7) were used for pixel-based classification. Additionally, a subset of spot images mosaic of the study area was compiled, which was used for soft method of object-based classification. Population growth rate (%) % Year Population Fig. 2: Population growth in Greater Cairo (modified after CAPMAS) 4.2 Pixel-based classification Supervised classification was performed using TM and ETM+ bands. In supervised classification, the basic steps followed were (1) select training samples which are representative and typical for that information class; (2) perform classification after specifying the training samples set and classification algorithms. Training samples were selected according to ground truth. These homogenous areas were identified in the image to form the training samples for all of the information classes. The selected algorithm for performing the supervised classification was the minimum-distance classification. In this algorithm first the mean spectral value in each band for each class is determined. These values comprise the mean vector for each class. This distance threshold could vary for each class depending on the expected degree of compactness of that class. Compactness might be estimated from the standard deviation for each feature of the pixels making up the training sample for a given class. 4.3 Object-based classification Erdas Imagine 2010 was used for object-oriented analysis and classification. Segmentation is the main process in the classification module in Erdas software and its aim is to create meaningful objects. This means that an image object should ideally represent the pattern of each object in question. This pattern combined with further derivative color and texture properties can be used to initially classify the image by classifying the generated image objects. Thereby the classes are organized within a class hierarchy. With respect to the multi-scale behavior of the objects to detect a number of small objects can be aggregated to form larger objects constructing a semantic hierarchy (Matinfar et al, 2007). In performing the segmentation of the Spot image, four spectral bands (5 m resolution 1, 2, 3, 4) took in the segmentation process with full weight. 5 RESULTS Six land use/land cover (LU/LC) classes were recognized based on change detection in the first level (pixelbased classification) to be distributed in the study area: Urban areas (U), Cultivated Land (CL), Cultivated to Urban (CU), Desert (D), Bare Soil (BS), and Water Bodies (WB) (Fig. 3). Proceedings REAL CORP 2011 Tagungsband May 2011, Essen. ISBN: (CD-ROM); ISBN: (Print) Editors: Manfred SCHRENK, Vasily V. POPOVICH, Peter ZEILE 1253
4 Fig. 3: LC/LU multitemporal classified maps represented the change detection in study area LU / LC (Land 1984 % 1990 % 2006 % use/cover) U (Urban areas) CL (Cultivated land) CU (Cultivated to urban) D (Desert area) BS (Bare soil) WB (Water Bodies) Table 1: Percentage of LU/LC classes in the study area The following are short comings that limit the accuracy of classification based multi-resolution/ multitemporal change detection by using the pixel-based classification techniques: Limited spectral separation of classes. The statistical independence assumption pixel-based classifications involve the DN values individually without considering the neighbourhood pixels (Castelli et al., 1999). Land cover maps derived from classification of images usually contain some sort of errors due to several factors that range from classification techniques to methods of satellite data capture. Hence, evaluation of classification results is an important process in the classification procedure. The intrinsic limitation of classifiers comparison of image data in a change detection procedure requires more research that would involve new approaches of multi-scale analysis. Two levels for automatic identification of the urban classes on the multi-spectral spot mosaic were applied by image segmentation module in Erdas Imagine software for the object-oriented classification: 1) Formal-informal urbanization level (Fig. 4). 2) Informal urbanization segmentations level (Fig. 5) REAL CORP 2011: CHANGE FOR STABILITY: Lifecycles of Cities and Regions
5 Ahmed Abdelhalim M. Hassan Fig. 4: The distribution of formal (green) and informal urbanization (red) in the study area Fig. 5: The classes of informal urbanization in the study area according to the textural density and shape Proceedings REAL CORP 2011 Tagungsband May 2011, Essen. ISBN: (CD-ROM); ISBN: (Print) Editors: Manfred SCHRENK, Vasily V. POPOVICH, Peter ZEILE 1255
6 Obiects are described by their specific spectral information, shape, and texture. The brightness relationship of adjacent image objects was worked out explicity. For that purpose, the relationships between objects were established. Based upon the objects and the class descriptions, a fuzzy soft-classifcation was implemented. Whatever, shape characteristics such as size and density of objects, and neighbourhoods characteristics for topological and brightness relationships analyses, were used. The first-level classification of pixel-based method was integrated into the object-based segmentation, which represented the second level of classification. Objects in the second-level classification were concerned to describe the formal and informal urbanization. A further classification process could be carried out to generate the third level of segmentation. This level was distinguished by four child classes (LUC1, LUC2, LUC3, LUC4). These child classes were described as low, moderate, high, very high dense urbanization respectively. 6 CONCLUSION It can be concluded that the pixel-based classification, which was applied on Landsat TM and ETM+ timeseries images, is useful for monitoring the dynamic increasing of megacities. While the object-oriented classification deals more sufficiently with the urban environment including formal and informal buildings. The high level of object-oriented segmentation, which was applied on the very high resolution images, is recommended for sub-object accuracy classification. Analysis of census by using such classification could be inaccurate. For example, in Greater Cairo the high densities of houses are not reflecting real population densities, due to the many houses are empty or partially empty. Moreover, a rate of urbanization growth in Greater Cairo during the last three decades could be described as geometrical progression. 7 REFERENCES Anderson D. E., E. Hardy, R. J and R. Witmer: A Land Use and Land Cover Classification System for Use with Remote Sensor Data.Washington D. C., U.S. Geological Survey Castelli V., C. D. Elvidge, C. S. Li and J. J. Turek: Classification-based change detection Theory and applications to the NALC dataset. In remote sensing change detection: Environmental monitoring methods and applications, edited by R.S. Lunetta and C. D. Elvidge.London, UK: Taylor & Francis, CAPMAS (Central Agency for Public Mobilization and Statistics), Population Census, Egypt Electronic document available at: Griffiths P., Hostert P., GruebnerO., and Linden S.,: Mapping megacity growth with multi-sensor data. Remote Sensing of Environment 114, Netzband M., William L. Stefanov, and Charles Redman Springer: Reference Book: (Applied remote Sensing for Urban Planning, Governance and Sustainability) Maktav D., Erbek, F. S., & Jurgens, C.: Remote sensing of urban areas.international Journal of Remote Sensing, 26, Miller R. B., & Small, C.: Cities from space: Potential applications of remote sensing in urban environmental research and policy. Environmental Science & Policy, 6, Ridd M.: Exploring a V-I-S (Vegetation-Impervious SurfaceSoil) Model for Urban Ecosystem Analysis through Remote Sensing: Comparative Anatomy of Cities. International Journal ofremote Sensing 16 (12): Rashed T., J.R. Weeks, M.S. Gadalla and A.G. Hill: Revealing the anatomy of cities through mixture analysis of multispectral satellite imagery: A case study of the Greater Cairo Region, Egypt, Geocarto International 16, pp REAL CORP 2011: CHANGE FOR STABILITY: Lifecycles of Cities and Regions
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